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msghdr.c: fix printing SCM_RIGHTS array

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* msghdr.c (print_scm_rights): Do not print array elements outside
bounds defined by struct cmsghdr.cmsg_len.
This commit is contained in:
Дмитрий Левин 2016-06-30 22:20:56 +00:00
parent 6c30aecaf3
commit 029d979767
1 changed files with 8 additions and 8 deletions
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16
msghdr.c
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@ -59,20 +59,20 @@ print_scm_rights(struct tcb *tcp, const void *cmsg_data,
const size_t data_len) const size_t data_len)
{ {
const int *fds = cmsg_data; const int *fds = cmsg_data;
const char *end = (const char *) cmsg_data + data_len; const size_t nfds = data_len / sizeof(*fds);
bool seen = false; size_t i;
if (sizeof(*fds) > data_len) if (!nfds)
return; return;
tprints(", cmsg_data=["); tprints(", cmsg_data=[");
while ((const char *) fds < end) {
if (seen) for (i = 0; i < nfds; ++i) {
if (i)
tprints(", "); tprints(", ");
else printfd(tcp, fds[i]);
seen = true;
printfd(tcp, *fds++);
} }
tprints("]"); tprints("]");
} }